Fusing mechanism.



C. PFANSTIEHL.

FUSING MECHANISNI.

APPLICATION min Junl 14.1911.

Patellted Jan. 7,1919.

3 SHEETS-SHEETI l C. PFANSTIEHL.

FUSING IVIECHANISIVI.

APPLICATION FILED JULI 14,1917.

3 SHEETS-SHEET 2.

Patented @11.11919 O 40 -J-V O C. PFANSTIEHL.

FUSNG MECHANISNI. ABPLICATION FILED 1uLY14.1911.

Patented Jan. 7, 1919.

3 SHEETS-SHEET 3.

N9# WN if@ @A V j u IIIIITIIMMI Ilflw 1@ N ktm@ S E @n mm S UNITED lSTATES PATENT oFFIcE.

CARI. PINSTIEHL, OFHIGHLAND PA'BK, ILLINOIS, ASSIGNOB T0 PFANSTIEHL COMPANY, INC., 0F NORTH CHICAGO, ILLINOIS, A CORPORATION OF NEW YORK.

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specification of Letters ramt.

Patented J ain-7, 1919.

Application filed July 14, 1917. serial No. 180,534.

To all whom tmay concern.'

Be'it known that L'CARL PFANSTIEHL, a citizen of the United States, residing at Highland Park, in 'the county of Lake and State of Illinois,l have invented a certain new and useful Improvement in Fusing Mechanism,eof which the following is a full, clear, concise, and exact description, reference/being had to the accompanying drawy outer end lof th shaft 14 is keyed/to a scribed a'process for uniting a valve head to a valve stem by fusion, the stem and head having different characteristics so tha'teach is best suited for the severe conditions under which it is required to operate.

The present invention relatesto the mechanism and circuit arrangements for carrying out the process. The object of the present invention is the provision of a generally improved fusing machine and circuit arrangement therefor, which is simple in construe'- tion and reliable and eiiicientin its operation. One improved feature of the device is the provision 'of automatic switching mechanism for controlling an electric circuit 'and automatically operated when the elements to be fused or united assume a certain predetermined relationship.

This and other objects of the present invention will be pointed out in detail in connection with the accompanying drawings, wherein- Figure l is a side elevational view of the fusing machine;

Fig. 2 is a front view of Fig. l; and

Fig. 3 is a diagrammatic circuit drawing, showing the various electric connections employed.

Similar characters of reference refer to similar parts throughout the several views. Referring rst to Fig. 1, 4 designates a frame or bracket provided at its lower end with an enlargement 5 to facilitate connection of the bracket onto a table or other suitable support. Extending vertically through the upper end of the frame 4 is a slot 6, whose vertically extending edges 7 and 8 are provided with the vertically extending guide pieces .9 Vand 10. Reciprocably mounted between the guide members 9 and 10 is a block 11, the rear sideof Awhich -is provided with a gear rack 12 adapted to mesh with a gear .13 keyed to ajshaft 1 4; The shaft 14 extends horizontally across the' back of the frame 4, and is supported by` the journal pieces shown at 15 and 16. The

' end of a rod 22 carrying a weight 23.

The block iris' provided with an Oufwardly extending piece 24 to whichis attached at 25, 25, by means of bolts or other suitable securing means, an inverted U piece 26, whose upper end is threaded and arranged to receive the adjustable screw 27. Extending through :the 4slot'28 provided in theframe 4 under the slot 6 is a massive` copper electrode 29,y which is attached to the block 11 by a pairvof bolts or screws, one of which is shown at 30 in Fig. 1. The copper electrode 29 is insulated from the block 11 by a collar of insulating material 31, which is positioned' around the screw 30 and Within-the copper electrode. Attached to the copper electrode 29 by the screws A32, -32 is av clamping member .33 having its lower front side cut away as shown at 34, and arranged to coperate with a second removable .clamping member 35 arranged to be held in place by the screws 36, 36, which screw-thread into the clamp-v ing member 33. Extending vertically through the clamping members, the electrode 29 and the outwardly extending piece 24 of the block 1l is a bore 37, which is lined with insulating material 371. This bore is arranged to receive a puppet valve stem 38, the stem being held in place by the clamping members 33 and 35. The Valve stem 38 is inserted into the bore 37 from the bottom, and its position with respect to the electrode may be determined by sett-ing the screw 27.

Extending through the slot 28 and lying below the electrode' 29 is a second massive electrode 39, which is -ins lated from'the with the conduit 45, andthe'member 42 with the conduit' 46, bot-h of which extend from the atmosphere to the sealed space around the valve stem and head. When the machine is in operation one of the conduits isconnected with a source of hydrogen or some other inert gas.

Fixed to the electrode 29 is an adjustable screw 47 arranged, when the electrode 29 is moved a certain predetermined distance downwardly, to .engage a `spring contact member 49 carried by the electrode 39. The contact member 48-is adapted to coperate with a second contact 50 to control an electric circuit,v as will be pointed out presently. From the construction thus far described it will be observed thatthe contacts 48 and 50, which are normally closed, may be automatically opened by the adjustable screw 47 after the electrode 29 has been moved downl wardly a certainv predetermined distance. The rear ends of the electrodes 29 and 39 are connected at 51 and 52 with a large copper -conductor 53, which forms the secondary winding of a transformer 54, the pri'- mary be'ing provided by the two coils shown at 55.

In Fig. 3 l have shown.`the circuit arrangement employed with the machine, and in this igure I have shown the copper electrodes at 29 arid 30 connected with the transformer 54, which is shown diagrammatically. One end of the primary winding of the transformer is connected through the conductor 56 with one brush ofan alternating current generator 57 the other brush of the generator being connected through the conductor 58 with a contact plate 59 of a manually operated switch'memberl 60. The plate 59 is adapted to be electrically connected with the plate 61 connected to the conductor 62, extending to contact 63 carried by the magnetic circuit breaker 64. This circuit breaker comprises a coil 65, an armature 66 and a contact piece 67 carried at the outer end 'of the armature. The contact piece 67 is arranged t o engage the contacts 63 and 68 upon energlzatlon ofthe coil 65. The contact 68 is connected through the conductor 69 with the end of the primary winding of the transformer opposite the conductor 56. Connected across the contacts 63 and 68 is an inductance coil 70,

which acts as a resistance to the current sent through the primary winding of` the transformer when the' armature of the magnetic circuit'breaker assumes the position illustrated in Fig. 3. The automatically operated contacts 48'and 50 are shown diagrammatically in this figure, and are included 1n the following circuit. The contact 48 is connected with the dry cells 71, the other side4 of the cells being connected through the conductor 72 vwith one side of the coil 65 of the magnetic circuit breaker. The Iother side of the coil Vis connected through u the conductor' 73 with a contact piece74, arranged to be connected with the contact piece 75, in

Iturn connected through to the contact 50. The switching mechanism 60 comprises, together heretofore mentioned, a' movable lever 76 pivoted at 77 to the jframe. 'Upon depressionl of the outer end of this lever the contacts 59 and 61 andthe contacts 74 and 75 are electrically connected. The operation of the device `is as follows In placing. a valve head and stem between the electrodes 29 and 39, the shaft 14 is ro- .tated'in a clockwise. direction (Fig. 1) by LAthe. handle piece 19., so as to move thel electrode 29 upwardly awa from the electrode w39. Theinclosure mem er 44 is then moved out of the way, the valve head 43 placed in position, and the valve stem 38 vinserted into the bore 37. The inclosure 44 is then put back inplace and the handle piece 19 is released, Upon'release of the handle piece the Weight 23 comes into operation to swingv its lever 20 in a counter-clockwise direction.

(Fig. 1) to force theelectrode l29 downwardly,and thus the valve stem 38 into engagement with the valve head 43. The lever 76 of the switch 60 is then depressed, thereby providing an electric circuit from the alternating -current generators 57 through the conductor 5,8, contacts 59and 61, conductor 62, contact 63, ,contact plate 67 (which is pulled upwardly due to the battery circuit and closed contacts 48 and`50), contact 68, conductor 69 through the rimary winding of the transformer and conv uctor 56 back to thegenerator. This circuit, through-the primary winding ofthe transformer, results in a high inductive current inu'the secondary winding 53, which is utilized tol fuse the v valvefstem to the valve head. As the currentv passes from the valve stem to the head, the stem is melted and moved downwardly vby the weight 23. ,After the stem has been moved a certain predetermined distance the adjustable screw 47 comes into operation to move the contact member 48 away from the contact 50, and thereby Ibreaks-the battery circuit. The breaking or interrupting of this circuit causes denergization of the coil 65, with the result that the contact'plate 67 is moved out of engagement with the conthe conductor 761 tacts 63 and 68, so that the primary Winding circuit of the transformer includes the inductance coil 70. The current through the primary winding is thus decreased and the valve s'tem and head permitted to cool gradually. After a suficient time for the cooling of the stem and head has elapsed, the lever 7G of the switch 60 is released and the generator circuit, as well as the battery circuit, is thereby interrupted.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

l. Fusing mechanism comprising a frame, a pair of electrodes carried thereby, one of which is movable toward and away from the other, a gear rack attached to the movable electrode, a gear carried by the frame and meshing with the gear rack, and means tending to rotate the gear in a direction to feed the movable electrode toward the other one of said electrodes with a predetermined pressure.

2. Electric fusing mechanism comprising a. frame, a pair of electrodes carried thereby, one of the electrodes being movable toward and away from the other electrode, an electric circuit for the electrodes, al resistance, and switching mechanism operated by the movable electrode for introducing the resistance into the said circuit when the movable electrode assumes a certain predetermined position with respect to the other of said electrodes.

3. Electric fusing mechanism comprising a frame` a pair of electrodes carried thereby, one of the electrodes being movable toward and away from the other` a transformer, a

primary circuit therefor, a secondary circuit for the transformer including the said pair of electrodes, a resistance, a magnetic .switch for connecting't-he resistance in t-he primary circuit, a controlling circuit for the magnetic switch, and an automatic switch in the controlling circuit and operated by the movable electrode for controlling the operation of the magnetic switch.

4. In a fusing machine. the combination with a source of alternating current, of a transformer, a main switch controlling the primary circuit of said transformer, an impedance device included in the circuit of said -transformer and said source by the closure of said switch, a relay having contacts lfor shunting said impedance device, adapted to close lthe circuit of the coil of said relay to shunt said impedance device during the initial fusing operation, and means for opening said switch and removing said shunt after the fusing operation until thel main switch is opened.

5. Electric fusing mechanism comprising a frame. a pair of electrodes carried thereby, one of said electrodes being movable toward and away from the other electrode, an electric circuit for the electrodes, a resistance and means for automatically introducing said resistance into said circuit at the completion cf the welding operation.

In witness whereof, I hereunto subscribe my name this 11th day of July, A. D. 1917.

CARL PFANSTIEHL.

Witnesses IRENE SCUUMANN, W. R. NETHERCUT. 

